Cleveland C16668 5/64 Inch Cobalt Jobber Drill Bit

Product Description

The CLEVELAND C16668 is a cobalt jobber-length drill bit designed for heavy-duty drilling in ferrous metals and hard materials. Built from M42 cobalt high-speed steel and coated with Titanium Nitride (TiN), the bit resists heat buildup and extends tool life in demanding production environments. The 135-degree split point starts on contact without center-punching and reduces walking on hard surfaces. With a 2-inch overall length and a parabolic flute design, the C16668 is suited for machine shop work, metal fabrication, and maintenance repair operations where precision and durability are required. It is installed and used by machinists, tool-and-die workers, and maintenance technicians.

The C16668 is sized at 5/64 inch (0.0781 inch decimal) and is optimized for drilling steel and cast iron in production or job-site applications. The parabolic flute geometry promotes efficient chip evacuation, reducing heat and chip packing in deep holes. The straight cylindrical shank fits standard drill chucks without adapters. This bit is part of the CLEVELAND 2075T series, which is built to ASME B94.11M and DIN 338 standards for consistent dimensional accuracy across the cutting tool inventory.

Key Features

• M42 cobalt high-speed steel construction rated for heavy-duty use in steel and cast iron
• TiN coating reduces friction and extends edge life in high-cycle drilling
• 135-degree split point for self-starting, reduced feed force, and minimal workpiece marking
• Parabolic flute profile improves chip evacuation and reduces heat in deep drilling
• Web-thinned tapered web for lower thrust requirements and improved center stability
• Straight cylindrical shank compatible with standard drill chucks; no adapter required

Compatibility

Designed for use in steel and cast iron workpieces. The straight shank is compatible with standard drill chucks accepting 5/64 inch (0.0781 inch) shanks. Conforms to ASME B94.11M and DIN 338 standards.

Installation Notes

Install the shank fully and securely into the drill chuck before operation and confirm the chuck key is removed before powering the spindle. Use appropriate cutting fluid or coolant when drilling steel to manage heat, as this bit does not support through-coolant delivery. Secure the workpiece firmly to prevent movement during drilling. Follow shop safety practices and applicable OSHA machine guarding requirements when operating drilling equipment.